Pressure-retaining device.



S. 6. DOWN. PRESSURE RETAINING DEVICE.

APPLKCATION K ILED NOV;18.19l6.

Patented Feb. 18, 1919.

1 l r w R o T w E v m lit dill

application tiled lt'oveinber it. ll-llfl.

To all whom it may concern:

Be it known that l, Sinner G. DowN, a citizen of the United States, residing at Berkeley, in the county of Alameda and State of California, have invented new and useful improvements in Pressureetaining Devices, or which the following is a specification.

This invention relates to fluid pr 'essure brakes and has for its principal 0b]e0t to provide means for retaining fluid pressure in one of a plurality of connect brake cylinders, of a locomotive brake equipment.

in the accompanying drawing, the single figure is a diagrammatic view, partly in section, of a locomotive brake equipment,

, showing my invention applied thereto.

The brake equipment shown in the dra wing comprises a distributing valve device it, connected to brake pipe 2, and by pipe 3 to locomotive brake cylinders d and a tender brake cylinder 5.

The distributing valve device 1 includes the usual equalizing valve device having ada ted to operate a brake cylinder supply vs vs 10 and a release valve ll.

be apparatus above described has heretoiore been employed, and in addition, according to my invention, a retaining valve device 12 is provided for retaining pressure in the tender brake cylinder, coinprising a weighted valve 13 and a manually operated cook it having a branched port in one position of the cocl: to connect passage 16 and pipe 17 leading to tender brake cylinder 5 with passage 18 and pipe 19 leading to pipe 3. ln another position of the cook, the port 15 connects passage 16 with the retaining valve 13 and the passage 18 is cut ofl.

he pipe 3 is also connected to the brake cylinder 5 through a by-pass pipe 20 con taining a check valve 21 for preventing back flow from the brake cylinder to the pipe 3. ln operation, it it is desired to apply and release the brakes without retaining fluid pressure in the tender brake cylinder, the cock 141i is turned to the position shown in the drawing, so that fluid under pressure specification 0t Letters Patent.

such as the tender brake cylinder Patented heb, lfl, ltd, flerial are. iaaoav. v

released from the tender wav of pipe 17, passage is supplied to and brake cylinder by 16, port 15, passage it, and pipe 19, by the usual operation oi the distri uting valve lit it is desired to retain fluid pressure in the tender brake cylinder, the cook it is turned so that ort 15 connects passage 16 with the retaining valve 13.

en the brakes are now applied, fluid under pressure is supplied through pipe 3 to the locomotive brake cylinders 4:: through by-pass 20 past check valve 2],, to

der brake cy inder 5. pon releasing the brakes, fluid is released irom the pipe 3 and the locomotive brake cylinders a. From the tender brake cylinder 5, fluid in excess of the liltin pressure of the retaining valve 13 is vente by the lifting of said valve, through passage 22, passage 18, and 3 and then the valve closes, so that the remaining fluid pressure in the brake cyliner is retained. 7

By means of the above described construction, it will be seen that fluid pressure can be retained in plurality oil con cylinders, without interl ering brakes in the other brake cylinders.

aving now described my invention, what I claim as new anddesire to secure by Letters Patent, is:

1. llna fluid pressure brake, the combination with a plurality of brake cylinders and an application and release stant the coinbinat1on with a p urality of brake cylinders and an application and release pipe constantly connected to one brake cylinder, of a retaining valve for controlling the refluid from another e application and release by-pass for supplying fluid from the ap plication and release pipe to said brake cylinder and containing a check valve for preventing back flow.

in a fluid pressure brake, tion with a plurality of pipe and a the combinabrake cylinders pipe 19 t pipe brake cylinder til and an application and release ipe constantly connected to one brake cylinder, of a retaining valve for controlling a communication from another brake cylinder to said pipe and a cock adapted in one position to cut oil communication from said brake cylinder through the retaining valve and to connect said brake cylinder with the application and release pipe.

1 4- In a fluid pressure brake, the combination. with a plurality of brakecylinders and an application and release pipe con- 4 stantly connected to one brake cylinder, of a retaining valve for controlling a communication from another brake cylinder to said pipe and a cock adapted in one position to establish communication from. said brake cylinder through the retaining valve to said application and release pipe and in another position to cut oii said communication and connect said brake cylinder directly to said 1pc. i P 5. In a fluid pressure brake, the combine tion with a plurality of brake cylinders having a common application and release pipe, of a retainingvalve for controlling a communication from one brake cylinder to the application and release pipe,- a cock having one position for connecting said brake cylinderwith the retaining valve and another position for connecting the brake cylinder directly with said pipe, and a bypass pipe through which fluid is supplied from the application and release pipe to said brake cylinder and containing a check 3 valve for preventing back flow.

\In testimony whereof I have hereunto set my hand.

SIDNEY G. DOWN. 

